Envelope



y 31 1927 c. BIEDERMANNM ENVELOPE Filed April 2'7, i923 HDREJSE V "which differs from envelopes of'known conaluminium foil and'with an'op'en' side Patented May 31,1927.- v 7' es P A-Teasi-beige cam. BI DERMA'NN, o r uonRNn-swITzERLAND.

' n v Lor-n;

. Application filed 21 m27,-192aMse ia1no. 635,158. g

The commonly used "envelopes are [generally made of'paper and.only-those designedfor storing valuables are made of canvas. Envelopes of the former type'can be used only once whereby the expenses :of bigger firms are considerably increased. v

This invention relates to an envelope struction by the fact that it can be used repeatedly and that the contents' of the same i are well protected againstfbeing creased and] against unlawful removal; This object is attained by making the envelopes from by a removable element.

Three embodiments of the invention shown'by way'of example on theaccompany-j I ing. drawing, wherein:

' showing the preferred form ofconstruction;

Fig. 1 shows 1n elevatlona window-'envelope. Fig.2 is-a section on line III of Fig. 1,

Fig. 3 shows in front elevation, and g 3 Fig. .4 shows in rear view an'envelope of the second form of construction;

s Fig. 5 is a sidejelevatio'mand Fig. 6 is a section on line .11 II-i of Fig.

' 5 showing a third form of construction,

According to the first form of'construction (Figs. '1 and '2 the envelope consists of a sheet of aluminium foil folded to form a "pocket having a front wall 1 and a rear wall 2. The front wall 1 has at both sides flaps 3 which-are folded over and rigidly fixed on the rear wall, for instance by pressing or,

' denting. ,The' front'wall and therear wall a have each slits 4. in proximity to the upper en side of the envelope through which slits passes thetape 5. This tape is of paper and its ends are glued together on the back of the envelope. Thefront wall has a transparent window as usual through which i the address can be read which is writtenon theletter enclosed in the envelope. The

windowfi consists of anaperturewhich may be closed by transparent paper.

To openthe envelopethe paper tape-5is simplydestroyed and for'sealing an envelope 7 a tape is insertedjthrough the slits 4 the ends of the tape being glued together on the back ofthe envelope. 1 H J.

closed quentlyi' used bands i a e The envelope of' the thirdeforrn'of coni I g struction showninfFigs 5and 6 differs from thosev which have been described above in from a sheet of'aluminium foil: 'Atthe side 7 the ends 9 ,of the vpaper.strip 10 are inserted, said 'ends9 beingglued together so that the envelope is securely sealed; The v addressfiof the. 'jreceiver is 7. written on' thef front side of they paperistrip" 10; the address of thesenderbeing-written 'on'the" rear side ofithel; strip f' 'Addres sesif-which' are he may be printed QII 'theSe f I that the-envelopeis designed: to be used for the safe keeping of documents. The enveglopeof aluminium -foil"composed of a front I wall 1* and "rearfwall 2 connected by flaps 3 I has near itsupper open edge several holes 11 5 f a arranged. at fconvenient distances apart through which a string 12 is twined. The 1 ends of the string 12 aresecurely connected by a seal l3f'so that it is impossible to open the envelope withoutjdestroyingthe seal or'f 1 cutting thejstring,

At the open edge oftheenvelopeflaps could further be. arranged which have to be securely connected one with the other by leadlseals whereby the safety of. the enve-,

lopeis increased: In this case the envelope could be used'fonly once as it would'be impossible to remove the lead seal withoutdee stroyingthe flaps.

type will be frequently used.

The connection of the front wa other convenient manner asdescribed. v

Enve10pes t0 -b e used for printed matter i and. commercial papers'fare preferably made, x as. is'actu'ally. he case, with a. flap onthe i i f I upper edge'ofthevfrontwall; I

. The ;,aluminium foil is 0,1 to 0,4 millimeter thick and it is to be expected that owing to I the'adva'ntages realized the envelopesofthiea wall could evidently be effectedr'alsoin any.

ss'l I c1aim:.-- s I envelope for repeated use comprising in combination a pocket of aluminium foil open at the top end having awindow at a 5 convenient point of the front well through v which the address Written on the, enclosure can be read and vertical slits near the top edges of the reer and front Walls," Qmd 3 paper, band to be vrmssecl through said slits,

and the endsof sziid' paper band to be con 0 nected on'the rear'ofthe envelope by sealing. v V

Intestirn'ony whereof I affix my signature. 

